The audio files linked to this article were recorded from scanner communications Thursday, April 18 in to Friday, April 19, 2013. They start in Cambridge as police responded to MIT, where MIT Police Officer Sean Collier was shot and killed. The next recording picks up from a carjacking in Cambridge to a chase in Watertown. The next one chronicles the shootout in a Watertown neighborhood between the bombing suspects and police. Finally, the last recording was also in Watertown, when police captured Dzhokhar Tsarnaev hiding in a boat.

The audio files linked to this article were recorded from scanner communications Thursday, April 18 in to Friday, April 19, 2013. They start in Cambridge as police responded to MIT, where MIT Police Officer Sean Collier was shot and killed. The next recording picks up from a carjacking in Cambridge to a chase in Watertown. The next one chronicles the shootout in a Watertown neighborhood between the bombing suspects and police. Finally, the last recording was also in Watertown, when police captured Dzhokhar Tsarnaev hiding in a boat.